Olympus MMF-3 Weathersealed Dust-proof and Splash-Proof Four Thirds Mount Adapter - Four Thirds Lens to Micro Four Thirds Lens Mount Adapter


See all shipping options

In Stock & Ready to Ship

Top Rated Gear

Our Price

Buy more and save
Quantity Discount

The quantity discount will be reflected in your shopping cart

About Olympus

The Olympus MMF-3 Four Thirds Mount Adapter is a dust - and splashproof lens mount adapter makes it possible to mount any existing Four Thirds lens on a Micro Four Thirds standard-compliant digital camera, including Olympus OM-D Series and Olympus PEN Series models. Because of its weathersealing, this adapter is preferable to the earlier MMF-2 and MMF-1 if you will be shooting in inclement or uncertain weather. It is ideal for getting the most value out of your weathersealed and Super High Grade Four Thirds-compliant lenses.

AF shooting using Live View is possible with lenses featuring contrast AF compatibility. When a contrast AF incompatible lens is used, the AF assist function engages.

Summary of Customer Reviews

Customers most agreed on the following attributes:
Easy to use (6),Lightweight (6),Durable (3),Reliable (3)
Reviewer Profile:
Semi-professional (3)

Reviews about this item

Review Snapshot®


(based on 7 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Does what it says

This is an adapter for using older E-1 through E-5 Zuiko Digital lenses on the E-M1. It works fine with all of my 4/3 lenses and does what it says.


Most Liked Negative Review


Functional but costly

This certainly does the job, but Olympus charges a premium for essentially adding a tiny o-ring to the adapter. Fittings are all metal.

Reviewed by 7 customers


Does what it says


from Tyler TX  -  Photo Enthusiast

This is an adapter for using older E-1 through E-5 Zuiko Digital lenses on the E-M1. It works fine with all of my 4/3 lenses and does what it says.


Adorama used Demo unit arrived flawless


from Westford, MA  -  Photo Enthusiast

I wanted to save some money and bought this one through Adorama's used stock. This one was marked "D" which I believe is for store display/demo units. Arrived very quickly and was in pristine shape. Great way to get good gear and save a few bucks that can be spent on other stuff. I will definitely buy used from Adoroma in the future when possible. The adapter itself is a bit overpriced (by Olympus) for what it is, which is basically a plastic and metal tube adapter with pass through contacts. I know you can buy cheaper third party knockoffs of these adapters, but the MMF-3 is weathersealed as is my camera and lenses, so didn't want to go cheap with a third party adapter that wasn't weathersealed. The adapter is very lightweight as it is mostly plastic but also seems very solid when mounted. There is no play between adapter and camera nor between lens and adapter. Everything is tightly coupled but still attaches and detaches smoothly.


Does what it needs to.


from Largo, FL  -  Semi-Professional

It bridges the gap that Olympus created when it stopped making E series cameras. Allows the use of all my pro quality 43 lenses on Pen size m43 bodies when I want to travel light. The only concern I have is balance and weight issues on the adapter and Pen body with the larger and heavier glass attached.


Solid fit for 4/3 lenses


from Palo Alto, CA

Although not cheap the excellent fit provides better results than the cheap aftermarket adapters. If you invest in high quality lenses don't lose their performance due to a loose fitting adapter.


Functional but costly


from Philadelphia  -  Semi-Professional

This certainly does the job, but Olympus charges a premium for essentially adding a tiny o-ring to the adapter. Fittings are all metal.


Can now use my 4/3 lenses


from Georgetown, TX  -  Semi-Professional

Enjoying using my Olympus 12-60 and 70-300 lenses with my OMD5 and EM1. A really nice viewfinder that's easy for me to see what I'm photographing unlike my E-620. Sometimes takes a while to get sharp focus. Don't now how good that would be with moving subjects. Haven't tried that yet. However, I'm definitely keeping it.


Range Expander


from Bayonne, NJ  -  Semi-pro Photographer

I started using digital capture with Olympus products because they did not cobble a digital camera from an existing 35mm body. They came out with a new design for their product. That being the case, I have a lot of 4/3 lenses. This adapter lets me use the 4/3 lenses on my micro 4/3 camera.


Questions & Answers Powered by TurnTo®

Questions about this item:

PATRICIA D  does this allow the use of the 1.4x EC-14 teleconverter on the mini camera's with the older len's only and not an R zoom lens ?
GARY B  Hey Patricia, this is a very good adapter, however if you do not need the splash and dust-proof you get the same performance from the mmf2. I have both and tell no difference in performance. It appears they only added a little "O" ring to the mmf3. Hope this helps
Shopper  I have several minolta lenses as well as a few sigma lens will this adapter work with them?
TERENCE C  I don't believe Minolta mounts (& Sigma, if it's the same as the Minolta mounts) are compatible with this Adapter, which is only compatible with a four thirds lens. If the mount on the Sigma lens is made for Canon or Nikon, third party adpaters are available. But I'm not aware of any third party converters from the Minolta mount to micro 4/3's.

Related Articles & Videos

10 All-in-One Camera Lenses That Do It All for Holidays 2014

Consider these all-in-one camera lenses for taking photos on the go. Also learn about what makes these camera lenses essential to a photographer. A new generation of superzoom telephoto lenses has arisen that can take in scenic vistas, zoom in on distant subjects, and focus up close for near-macr...Read More

First Look: Olympus's Retro OMD-EM5

New compact system echoes groundbreaking film SLR seriesRead More

Share this item:
Adorama.com is top rated for customer serviceHACKER SAFE certified sites prevent over 99.9% of hacker crime.